package com.itheima.agent.repository;

import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Component
public class InMemoryChatHistoryRepository implements ChatHistoryRepository{

    private final Map<String, List<String>> chatHistory = new HashMap<>();

    @Override
    public void save(String type, String chatId) {
        /*if (!chatHistory.containsKey(type)) {
            chatHistory.put(type, new ArrayList<>());
        }
        List<String> chatIds = chatHistory.get(type);*/
//        简化写法
        List<String> chatIds = chatHistory.computeIfAbsent(type, K -> new ArrayList<>());
        if (chatIds.contains(chatId)) {
            return;
        }
        chatIds.add(chatId);
    }

    @Override
    public List<String> getChatIds(String type) {
        /*List<String> chatIds = chatHistory.get(type);
        return chatIds != null ? chatIds : new ArrayList<>();*/
//        简化写法
        return chatHistory.getOrDefault(type, List.of());
    }
}
